Page 99 - Math Smart - 7
P. 99
Investigate rounding decimals between 7.1 and 7.2 to one decimal place.
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7.1 and 7.2 are examples
1 • 1
of numbers with one
7 • 2 decimal place.
Observe the pattern in rounding decimals to the nearest one decimal place.
Use a number line to help you.
7.1 7.11 7.12 7.13 7.14 7.15 7.17 7.18 7.19 7.2
O Fill in the missing numbers. The first one has been done for you.
a) 7.11 is rounded to 7.1 b) 7.12 is rounded to
c) 7.13 is rounded to d) 7.14 is rounded to
e) 7.15 is rounded to f) 7.16 is rounded to
g) 7.17 is rounded to h) 7.18 is rounded to
i) 7.19 is rounded to
O Use your answers in Question 1 to write down your conclusions for
rounding to one decimal place.
a) When the digit in the hundredths column is 1, 2, 3 or 4, then the
number Is rounded to the decimal .
b) When the digit in the hundredths column is 5, 6, 7, 8 or 9, then the
number is rounded to the decimal .
When we a number to the nearest 1 decimal place, we look
at the digit in the place.
If the digit < 5, we round it to the tenth,
If the digit = 5, we round it to the tenth,
If the digit > 5, we round it to the tenth.
A
